Abstract
Digitised colour images quantised at 24 bits per pel represent a considerable storage requirement. For many applications a coarser quantisation is allowable or even necessary. This paper describes three variations on a method to quantise RGB data at approximately 4 bits per pel. The main criterion in the scheme is that of a minimum perceptual distortion in the reproduced data. The MacAdam chromaticity domain is used as a perceptually metric space in which equal Euclidean distances may be assumed to represent equally perceived colour differences. Histogram and cluster analysis methods are used to quantise the RGB data at 4 bits luminance and 0-75 bits chromaticity. The results appear acceptably close to the originals.
Original language | English (US) |
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Pages (from-to) | 93-100 |
Number of pages | 8 |
Journal | Electronics and Communication Engineering Journal |
Volume | 1 |
Issue number | 2 |
DOIs | |
State | Published - 1989 |
Externally published | Yes |
ASJC Scopus subject areas
- Computer Networks and Communications
- Electrical and Electronic Engineering